US8419322B2 - Rotating cutting tool with support element - Google Patents

Rotating cutting tool with support element Download PDF

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Publication number
US8419322B2
US8419322B2 US12/737,516 US73751609A US8419322B2 US 8419322 B2 US8419322 B2 US 8419322B2 US 73751609 A US73751609 A US 73751609A US 8419322 B2 US8419322 B2 US 8419322B2
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US
United States
Prior art keywords
cutting
cutting edge
cutting tool
minor
blade
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active, expires
Application number
US12/737,516
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English (en)
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US20110116877A1 (en
Inventor
Erkan Hodza
Henry Schuett
Uwe Kretzschmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Komet Group GmbH
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Komet Group GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Assigned to KOMET GROUP GMBH reassignment KOMET GROUP GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SCHUETT, HENRY, HODZA, ERKAN, KRETZSCHMANN, UWE
Publication of US20110116877A1 publication Critical patent/US20110116877A1/en
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Publication of US8419322B2 publication Critical patent/US8419322B2/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B29/00—Holders for non-rotary cutting tools; Boring bars or boring heads; Accessories for tool holders
    • B23B29/03—Boring heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • B23B27/141—Specially shaped plate-like cutting inserts, i.e. length greater or equal to width, width greater than or equal to thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B29/00—Holders for non-rotary cutting tools; Boring bars or boring heads; Accessories for tool holders
    • B23B29/03—Boring heads
    • B23B29/034—Boring heads with tools moving radially, e.g. for making chamfers or undercuttings
    • B23B29/03403—Boring heads with tools moving radially, e.g. for making chamfers or undercuttings radially adjustable before starting manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/12—Side or flank surfaces
    • B23B2200/121—Side or flank surfaces with projections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/12—Side or flank surfaces
    • B23B2200/125—Side or flank surfaces discontinuous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/44—Margins, i.e. the narrow portion of the land which is not cut away to provide clearance on the circumferential surface
    • B23B2251/443—Double margin drills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/50—Drilling tools comprising cutting inserts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/19—Rotary cutting tool
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/19—Rotary cutting tool
    • Y10T407/1906—Rotary cutting tool including holder [i.e., head] having seat for inserted tool
    • Y10T407/1934—Rotary cutting tool including holder [i.e., head] having seat for inserted tool with separate means to fasten tool to holder
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/23—Cutters, for shaping including tool having plural alternatively usable cutting edges
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/909—Having peripherally spaced cutting edges

Definitions

  • the invention relates to a rotating cutting tool, in particular a boring tool, for use in machine tools, comprising at least one cutting insert preferably designed as an indexable cutting insert, comprising an active major cutting edge which is arranged in the region of an insert corner of the cutting insert, defines a pitch circle radius at its outermost end during rotary use and penetrates with a predetermined cutting depth into a workpiece in the region of a preformed round hole concentrically to the latter, comprising a minor cutting edge which adjoins the outermost end of the major cutting edge against a feed direction and is arranged over its entire length on a smaller radius than the pitch circle radius of the major cutting edge, comprising a minor cutting edge flank adjoining the minor cutting edge against the direction of rotation, and comprising at least one support element arranged at a distance from the major cutting edge against the feed direction.
  • the cutting tool according to the invention is rotated during the boring operation relative to a workpiece to be bored in the region of a preformed round hole. In this case it is only the relative rotation between cutting tool and workpiece that is important. When a “rotating cutting tool” is referred to below, the relative rotation is always meant.
  • the aim of the support element is to radially support the tool on the bore wall inside the bore.
  • Support elements of this type in the form of support strips or crowned support elements are known per se.
  • Such support elements are normally arranged at a distance from the indexable cutting insert on the parent body of the cutting tool (EP-0 586 423 B1).
  • the radius of revolution of the support element there is slightly smaller than the pitch circle radius of the active major cutting edge, such that the support elements first become effective upon boring through when the major cutting edge comes out of the bore during the boring operation and loses its guidance function.
  • the object of the invention is to improve a rotating cutting tool of the type specified at the beginning to the effect that the support elements already perform a supporting function inside the bore during the boring operation.
  • the solution according to the invention is based on the idea that the support element is not arranged on the parent body as previously but rather is arranged on the cutting insert and has, during the drilling operation, a radius of revolution larger than the pitch circle radius. This is intended to ensure that the tool is already supported during the boring operation, as a result of which the workpiece surface in the region of the bore wall is at the same time smoothed and thus refined.
  • the minor cutting edge flank has a support part which is arranged at a distance from the minor cutting edge against the direction of rotation and forms one of the support elements and the radius of revolution of which is greater than the pitch circle radius of the active major cutting edge by a projecting size.
  • a preferred configuration of the invention provides for the minor cutting edge flank to be subdivided into a primary minor cutting edge flank and a secondary minor cutting edge flank by a rounded portion arranged at a distance from the minor cutting edge against the direction of rotation, the support part being arranged in the region of the rounded portion.
  • the support part is advantageously designed to be elongated in the feed direction. It expediently has the outline form of a rectangle elongated in the feed direction or of an elongated triangle. Different outline forms can be produced in particular by different inclinations of the support part relative to the rotation axis. Thus the elongated triangle tapers to a point either in or against the feed direction.
  • the projecting size of the support part is advantageously selected to be ⁇ 20 ⁇ m, preferably ⁇ 5 ⁇ m, whereas the axial distance of the support part from the major cutting edge is preferably 0.01 R to 0.04 R, where R is the pitch circle radius of the major cutting edge.
  • At least two cutting inserts arranged at an equal circumferential distance from one another are provided. Furthermore, it is advantageous if the cutting insert designed as an indexable cutting insert has at least two major cutting edges with the associated support parts.
  • the indexable cutting inserts are fixed in a parent body by means of a clamping or tightening element.
  • the clamping element is in this case expediently designed as a clamping screw.
  • the measures according to the invention can be realized on indexable cutting inserts which are arranged on the parent body in either a radial horizontal position, radial vertical position or tangential vertical position.
  • FIG. 1 a shows a diagrammatic illustration of a boring tool with four indexable cutting inserts fitted in a radial horizontal position
  • FIG. 1 b shows a side view of the boring tool according to FIG. 1 a in the course of the boring operation
  • FIG. 1 c shows a two-edged indexable cutting insert for fitting in a parent body according to FIG. 1 a in a radial horizontal position or a tangential vertical position;
  • FIG. 1 d shows a diagrammatic illustration of an indexable cutting insert of the boring tool according to FIG. 1 a with indicated bore wall and support part of triangular outline;
  • FIG. 2 a shows a diagrammatic illustration of a boring tool with four indexable cutting inserts fitted in a tangential vertical position
  • FIG. 2 b shows a side view of the boring tool according to FIG. 2 a in the course of the boring operation
  • FIG. 3 a shows a diagrammatic illustration of a boring tool with four indexable cutting inserts fitted in a radial vertical position
  • FIG. 3 b shows a side view of the boring tool according to FIG. 3 a in the course of a boring operation
  • FIG. 3 c shows a diagrammatic illustration of an indexable cutting insert of the boring tool according to FIGS. 3 a and 3 b;
  • FIG. 3 d shows a diagrammatic illustration of the indexable cutting insert according to FIG. 3 a with indicated bore wall and support part of elongated rectangular outline;
  • FIG. 3 e shows an illustration corresponding to FIG. 3 d with support part of triangular outline
  • FIG. 4 a shows a diagrammatic illustration of a boring tool with three indexable cutting inserts of triangular outline fitted in a radial vertical position
  • FIG. 4 b shows a side view of the boring tool according to FIG. 4 a in the course of a boring operation
  • FIG. 4 c shows a diagrammatic illustration of the indexable cutting insert of triangular outline according to FIG. 4 a and FIG. 4 b;
  • FIG. 5 shows a scheme of the cutting lead geometry in the region of the minor cutting edge and of the minor cutting edge flanks for illustrating the geometrical relationships during the boring operation.
  • the cutting tools shown in the drawing are without exception designed as boring tools which are intended for boring a workpiece in the region of a preformed round hole.
  • the cutting tools essentially comprise a shank 10 , a parent body 12 arranged on the front face of the shank, and a coupling element 14 which is arranged on the rear end of the shank 10 and with which the cutting tool can be detachably coupled to a tool spindle of a machine tool.
  • a plurality of cutting inserts 16 ′, 16 ′′, 16 ′′′, 16 IV which are at a distance from one another, are designed as indexable cutting inserts and project axially and radially beyond the parent body 12 in the region of their active major cutting edges.
  • the flutes 18 adjoining the active major cutting edges and formed in the parent body 12 ensure that the chips produced during the boring operation can be received and discharged against the feed direction 34 .
  • the cutting inserts are each fixed on the parent body 12 by a clamping screw 22 .
  • the embodiments in FIGS. 1 to 4 differ in this case in the shape of the cutting inserts 16 ′, 16 ′′, 16 ′′′, 16 IV and in the way in which they are arranged on and attached to the parent body 12 , but do not differ in their function.
  • FIGS. 1 a to d four cutting inserts 16 ′ of rectangular outline are provided, said cutting inserts 16 ′ being inserted into insert seats 20 on the parent body 12 in a radial horizontal position and being fixed to the parent body 12 by means of clamping screws 22 oriented in an axially parallel manner.
  • an adjusting mechanism 24 for the radial fine adjustment of the cutting inserts 16 ′ in their insert seat 20 is located on each of the insert seats 20 .
  • the cutting inserts 16 ′′ of rectangular outline are inserted into their insert seats in a tangential vertical position and are fixed to the parent body 12 by means of radially oriented clamping screws 22 .
  • the four cutting inserts 16 ′′′ are inserted into their insert seats 20 in a radial vertical position and are fixed to the parent body 12 by means of tangentially oriented clamping screws 22 .
  • FIG. 4 a In the exemplary embodiment shown in FIG. 4 a , four cutting inserts 16 IV of triangular outline are provided, said cutting inserts 16 IV being inserted into the associated insert seats 20 in a radial vertical position and being fixed to the parent body by means of tangentially oriented clamping screws 22 .
  • a common feature of all the exemplary embodiments according to FIGS. 1 to 4 is the arrangement of the active major cutting edge 26 , which is located in the region of an insert corner 25 in the fitted state of the cutting inserts 16 , 16 ′′, 16 ′′′, 16 IV and which defines a pitch circle radius R at its outermost end 28 during the boring operation and penetrates with a predetermined cutting depth t into a workpiece 32 to be machined in the region of a preformed round hole 30 . Also provided on the cutting inserts is a minor cutting edge 36 which adjoins the outermost end 28 of the active major cutting edge 26 against a feed direction (arrow 34 ) and is arranged over its entire length on a smaller radius than the pitch circle radius R of the major cutting edge.
  • a minor cutting edge flank 38 adjoins the minor cutting edge 36 against the direction of rotation 37 and has a support part 40 which is arranged at a distance X from the minor cutting edge 36 against the direction of rotation 37 and the radius of revolution of which is greater than the pitch circle radius of the active major cutting edge by a projecting size Y ( FIG. 5 ).
  • a rounded portion 40 ′ which is arranged at a distance X from the minor cutting edge 36 and has a curvature radius r
  • the minor cutting edge flank 38 is subdivided into a primary minor cutting edge flank 38 ′ and a secondary minor cutting edge flank 38 ′′, the support part 40 being arranged in the region of the rounded portion 40 ′.
  • the curvature radius r of the rounded portion is expediently selected within the range of 0.01 to 3 mm.
  • FIG. 5 The above-described geometrical relationships of the cutting lead geometry in the region of the minor cutting edge 36 and of the minor cutting edge flank 38 are illustrated in FIG. 5 .
  • the geometrical location 42 ′ of the pitch circle with the radius R is also depicted there and corresponds in a workpiece 32 to be bored to the bore 42 with the radius R. It can be seen in FIG. 5 that the support part 40 with the projecting size Y projects beyond the pitch circle 42 ′ and thus leads, during the boring operation inside the bore 42 , to support and smoothing of the bore wall 44 produced beforehand by the major cutting edge.
  • the support parts 40 projecting beyond the pitch circle radius R have the outline form of a rectangle ( FIG. 3 d ) or triangle ( FIG. 1 d and FIG. 3 d ) elongated in the feed direction.
  • the elongated triangle tapers to a point in the feed direction 34 in the case of FIG. 1 d and against the feed direction in the case of FIG. 3 e .
  • the projecting size Y of the support part is selected in such a way that the friction remains low and smoothing of the bore wall 44 is possible without scoring. This is achieved if the projecting size Y is smaller than 5 ⁇ m
  • the distance X, measured in the circumferential direction, of the support part 40 from the minor cutting edge 36 is about 0.01 R to 0.04 R, where R is the pitch circle radius of the major cutting edge 26 .
  • the cutting inserts 16 ′, 16 ′′, 16 ′′′ are designed as indexable cutting inserts having two major cutting edges 26 each and the associated support parts 40 , whereas in the case of FIG. 4 triangular indexable cutting inserts 16 IV having three major cutting edges 26 and the associated support parts 40 are provided.
  • the base surface 46 and the non-active flanks serve to support the indexable cutting inserts in the associated insert seats 20 or in insert cassettes (not shown) for fixing and stabilizing in the parent body 12 .
  • the invention relates to a rotating cutting tool, in particular a boring tool for use in machine tools.
  • the cutting tool comprises at least one cutting insert 16 ′ which is designed as an indexable cutting insert and which has an active major cutting edge 26 which is arranged in the region of an insert corner 25 , defines a pitch circle radius R at its outer end during rotary use and penetrates with a predetermined cutting depth t into a workpiece 32 in the region of a preformed round hole 30 .
  • a minor cutting edge 36 which adjoins the outermost end 28 of the major cutting edge 26 against a feed direction 34 and is arranged over its entire length on a smaller radius than the pitch circle radius R of the major cutting edge 26 , and adjoining which against the direction of rotation 37 is a minor cutting edge flank 38 .
  • a special feature of the invention consists in the fact that the minor cutting edge flank 38 has a support part 40 which is arranged at a distance from the minor cutting edge 36 and the radius of revolution of which is greater than the pitch circle radius R of the active major cutting edge 26 by a projecting size Y.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
US12/737,516 2008-08-07 2009-07-24 Rotating cutting tool with support element Active 2030-05-08 US8419322B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102008036726.5 2008-08-07
DE102008036726A DE102008036726A1 (de) 2008-08-07 2008-08-07 Drehendes Schneidwerkzeug mit Stützelement
DE102008036726 2008-08-07
PCT/EP2009/059550 WO2010015530A1 (de) 2008-08-07 2009-07-24 Drehendes schneidwerkzeug mit stützelement

Publications (2)

Publication Number Publication Date
US20110116877A1 US20110116877A1 (en) 2011-05-19
US8419322B2 true US8419322B2 (en) 2013-04-16

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US12/737,516 Active 2030-05-08 US8419322B2 (en) 2008-08-07 2009-07-24 Rotating cutting tool with support element

Country Status (9)

Country Link
US (1) US8419322B2 (ja)
EP (1) EP2307163B1 (ja)
JP (1) JP5478622B2 (ja)
CN (1) CN102105251B (ja)
BR (1) BRPI0916669A2 (ja)
DE (1) DE102008036726A1 (ja)
IL (1) IL210500A (ja)
PL (1) PL2307163T3 (ja)
WO (1) WO2010015530A1 (ja)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015140781A1 (en) 2014-03-19 2015-09-24 Iscar Ltd. Drill or drill head with burnishing margin
US9498829B2 (en) 2013-03-06 2016-11-22 Allied Machine & Engineering Corp. Drilling system for deep holes
US10005136B2 (en) 2014-09-23 2018-06-26 Iscar, Ltd. Drill or drill head with burnishing margin
US10131008B2 (en) 2013-03-18 2018-11-20 Komet Group Gmbh Reaming element, reaming tool and method for the production thereof
US10421131B2 (en) 2015-05-08 2019-09-24 Taegutec, Ltd. Cutting tool

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Publication number Priority date Publication date Assignee Title
JP5893960B2 (ja) * 2012-02-29 2016-03-23 住友電気工業株式会社 刃先交換式内径加工用切削工具
US9636758B2 (en) * 2014-12-23 2017-05-02 Iscar, Ltd. Ramping insert and high-feed milling tool assembly
US9901992B2 (en) * 2014-12-23 2018-02-27 Iscar, Ltd. Ramping insert and high-feed milling tool assembly
CN112356318B (zh) * 2020-10-22 2022-12-06 陕西新高斯激光科技有限公司 一种圆形陶瓷板的快速切割装置

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US20120315099A1 (en) * 2007-01-17 2012-12-13 Sjoeoe Sture Rotatable Multi-Operation Tool for Chip Removing Machining, and a Basic Body Therefor

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9498829B2 (en) 2013-03-06 2016-11-22 Allied Machine & Engineering Corp. Drilling system for deep holes
US9943914B2 (en) 2013-03-06 2018-04-17 Allied Machine & Engineering Corp. Drilling system for deep holes
US10131008B2 (en) 2013-03-18 2018-11-20 Komet Group Gmbh Reaming element, reaming tool and method for the production thereof
WO2015140781A1 (en) 2014-03-19 2015-09-24 Iscar Ltd. Drill or drill head with burnishing margin
DE102015003205A1 (de) 2014-03-19 2015-09-24 Iscar Ltd. Bohrer und Bohrkopf mit Nebenfreifläche
US10005136B2 (en) 2014-09-23 2018-06-26 Iscar, Ltd. Drill or drill head with burnishing margin
US10421131B2 (en) 2015-05-08 2019-09-24 Taegutec, Ltd. Cutting tool

Also Published As

Publication number Publication date
IL210500A (en) 2013-10-31
DE102008036726A1 (de) 2010-02-11
CN102105251B (zh) 2012-07-04
JP2011529801A (ja) 2011-12-15
PL2307163T3 (pl) 2017-02-28
WO2010015530A1 (de) 2010-02-11
EP2307163B1 (de) 2016-09-07
CN102105251A (zh) 2011-06-22
BRPI0916669A2 (pt) 2015-11-17
IL210500A0 (en) 2011-03-31
EP2307163A1 (de) 2011-04-13
US20110116877A1 (en) 2011-05-19
JP5478622B2 (ja) 2014-04-23

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